<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 表单区域 -->
      <el-form ref="loginFromRef" :rules="loginFromRules" :model="loginFrom" class="login_from"
        label-width="0px">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginFrom.username" placeholder="用户名/邮箱/手机号"
            prefix-icon="iconfont icon-user">
          </el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input placeholder="密码" v-model="loginFrom.password"
            prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetFrom">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 表单的双向绑定的数据
      loginFrom: {
        username: 'admin',
        password: '123456'
      },
      //  表单的验证信息
      loginFromRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入活动密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetFrom () {
      // 点击重置按钮，重置表单
      // console.log(this);
      // resetFields() 函数是element提供的按钮重置函数
      this.$refs.loginFromRef.resetFields()
    },
    login () {
      // 点击登录按钮
      this.$refs.loginFromRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginFrom)
        if (res.meta.status != 200) {
          this.$message.error('登录失败')
        } else {
          this.$message.success('登录成功')
          // 1.将登陆成功之后的 token， 保存到客户端的sessionStorage 中，
          // 1.1 项目中除了登录之外的其它API接口，不许在登录之后才能访问
          //  1.2 token只应在当前网站打开期间生效，所以将token 保存在sessionStorage 中，
          window.sessionStorage.setItem('token', res.data.token)
          //  通过编程式导航跳转到后台主页，路由地址是/home
          this.$router.push('/home')
        }
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background: white;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  .avatar_box {
    height: 130px;
    width: 130px;
    background: white;
    border: 1px solid #eee;
    border-radius: 50%;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    padding: 5px;
    transform: translate(-50%, -50%);
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.login_from {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
